diff --git a/guix/import/cran.scm b/guix/import/cran.scm
index fd44d80915..e8caf080fd 100644
--- a/guix/import/cran.scm
+++ b/guix/import/cran.scm
@@ -1,5 +1,5 @@
 ;;; GNU Guix --- Functional package management for GNU
-;;; Copyright © 2015, 2016, 2017, 2018, 2019, 2020 Ricardo Wurmus <rekado@elephly.net>
+;;; Copyright © 2015, 2016, 2017, 2018, 2019, 2020, 2021 Ricardo Wurmus <rekado@elephly.net>
 ;;; Copyright © 2015, 2016, 2017, 2019, 2020 Ludovic Courtès <ludo@gnu.org>
 ;;; Copyright © 2017 Mathieu Othacehe <m.othacehe@gmail.com>
 ;;; Copyright © 2020 Martin Becze <mjbecze@riseup.net>
@@ -341,7 +341,11 @@ empty list when the FIELD cannot be found."
 ;; The field for system dependencies is often abused to specify non-package
 ;; dependencies (such as c++11).  This list is used to ignore them.
 (define invalid-packages
-  (list "c++11"))
+  (list "c++11"
+        "c++14"
+        "linux"
+        "getopt::long"
+        "xquartz"))
 
 (define cran-guix-name (cut guix-name "r-" <>))